大面積リボン状浮遊膜の分子配向制御による共役高分子系有機FETにおける異方性電荷輸送の検討

Conjugated polymers (CPs) have emerged as one of the potential candidates as active semiconducting elements in organic electronics owing to their low cost device fabrication in the area of organic field effect transistors, organic light emitting diodes and solar cells etc. The main feature of this class material lies in the preparation of the thin film via facile solution processing. CPs are susceptible to anisotropic charge transport owing to their inherent one-dimensional nature. In order to delineate optical anisotropy and anisotropic charge transport various techniques for molecular alignment of CPs have been attempted in the recent past. Existing problems like mechanical damage, solubility of under-layer and difficulty in multilayer film fabrication during molecular alignments needs the development of suitable methods. To circumvent these issues, floating film transfer method (FTM) having capability of anisotropic thin film fabrication have been proposed in the recent past. Although in the proposed FTM oriented films could be easily obtained, most commonly observed circular orientation hinders further upscaling of this method for the large area applications. In this thesis, a new improvisation for unidirectional film spreading during FTM have been made by implementing a newly designed PTFE slider leading to ribbon-shaped floating films and named as Ribbon-shaped FTM. A number of most widely used CPs such as PQT-C12, F8T2, non-regiocontrolled (NR) P3HT, PBTTT-C14, PTB7 and regioregular (RR) P3ATs etc. have been successfully oriented using ribbon-shaped FTM. These oriented films have been characterized by a number of techniques like polarized electronic absorption spectroscopy, atomic force microscopy, X-ray diffraction. Parametric optimization for film casting conditions such as viscosity/temperature of the liquid substrate, temperature and concentration polymer solution were amicably carried out. Influence of these casting conditions on the nature of ribbon-shaped FTM in terms of extent of macroscopic film formation, variation on the optical anisotropy and film thickness were investigated in detail. Amongst several CPs used for investigation, PQT-C12 exhibited not only the optical anisotropy but also the pronounced anisotropic charge transport with highest charge carrier mobility for OFETs based on oriented CPs. PQT-C12 was utilized for in-depth investigation pertaining to the implication molecular weight and its distribution on the optoelectronic anisotropies by synthetizing polymers with different molecular weight and polydispersity index (PDI). It has been found too high or low molecular weights or not favorable for promoting molecular orientation and relatively smaller PDI promotes the facile anisotropic charge transport. One of the batch of synthesized PQT-C12 and large area thin film by ribbon-shape FTM exhibited remarkably high optical anisotropy (DR?22) under at optimized casting condition. Microstructural investigation of these highly oriented films as probed by in plane GIXD exhibited edge-on orientation for the films fabricated under ambient conditions. A clear dependence of extent of molecular orientation on charge carrier mobility and anisotropic charge transport was demonstrated. Intractability of polythiophene led to development of RR-poly(3-alkylthiophene) derivatives but drastic decrease (4-5 orders) in mobility as function increasing alkyl chain length and enforced maximum research on hexyl substituted derivative (P3HT). Efforts were directed to prepare large area oriented thin films of RR-P3ATs by ribbon shaped FTM and influence of molecular orientation on alkyl chain length was investigated. A decease in DR with increasing alkyl chain length substitution was explained by increasing extent of interdigitating alkyl chains as confirmed by XRD results. Moreover, drastic hampering of charge carrier mobility as function of alkyl chain was not observed for FTM oriented films, which was explained by edge-on orientation as evidenced by in-plane GIXD investigations.九州工業大学博士学位論文 学位記番号：生工博甲第335号 学位授与年月日：平成31年3月25日1 Introduction|2 Experimental|3 Ribbon-shaped FTM: parametric optimizations|4 Charge transport in poly(quarterthiophene): Implication of optical anisotropy and molecular weight|5 Optoelectronic properties of conjugated polymers prepared by ribbon-shaped FTM|6 Orientation and anomalous charge transport in regioregular poly (3-alkylthiophenes)|7 General conclusion and future work九州工業大学平成30年

大面積リボン状浮遊膜の分子配向制御による共役高分子系有機FETにおける異方性電荷輸送の検討

九州工業大学博士学位論文（要旨）学位記番号：生工博甲第335号 学位授与年月日：平成31年3月25

Hybrid thin Films based Phototransistor Optimized by Dynamic Floating Film Transfer Method

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ILC Reference Design Report Volume 1 - Executive Summary

The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2s^-1. This report is the Executive Summary (Volume I) of the four volume Reference Design Report. It gives an overview of the physics at the ILC, the accelerator design and value estimate, the detector concepts, and the next steps towards project realization.The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2s^-1. This report is the Executive Summary (Volume I) of the four volume Reference Design Report. It gives an overview of the physics at the ILC, the accelerator design and value estimate, the detector concepts, and the next steps towards project realization

ILC Reference Design Report Volume 4 - Detectors

This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+e- collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, operating in push-pull mode, perfectly instrument the ILC interaction region, and access the full potential of ILC physics.This report, Volume IV of the International Linear Collider Reference Design Report, describes the detectors which will record and measure the charged and neutral particles produced in the ILC's high energy e+e- collisions. The physics of the ILC, and the environment of the machine-detector interface, pose new challenges for detector design. Several conceptual designs for the detector promise the needed performance, and ongoing detector R&D is addressing the outstanding technological issues. Two such detectors, operating in push-pull mode, perfectly instrument the ILC interaction region, and access the full potential of ILC physics

ILC Reference Design Report Volume 3 - Accelerator

The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2 s^-1. The complex includes a polarized electron source, an undulator-based positron source, two 6.7 km circumference damping rings, two-stage bunch compressors, two 11 km long main linacs and a 4.5 km long beam delivery system. This report is Volume III (Accelerator) of the four volume Reference Design Report, which describes the design and cost of the ILC.The International Linear Collider (ILC) is a 200-500 GeV center-of-mass high-luminosity linear electron-positron collider, based on 1.3 GHz superconducting radio-frequency (SCRF) accelerating cavities. The ILC has a total footprint of about 31 km and is designed for a peak luminosity of 2x10^34 cm^-2 s^-1. The complex includes a polarized electron source, an undulator-based positron source, two 6.7 km circumference damping rings, two-stage bunch compressors, two 11 km long main linacs and a 4.5 km long beam delivery system. This report is Volume III (Accelerator) of the four volume Reference Design Report, which describes the design and cost of the ILC

International Linear Collider Reference Design Report Volume 2: PHYSICS AT THE ILC

This article reviews the physics case for the ILC. Baseline running at 500 GeV as well as possible upgrades and options are discussed. The opportunities on Standard Model physics, Higgs physics, Supersymmetry and alternative theories beyond the Standard Model are described.This article reviews the physics case for the ILC. Baseline running at 500 GeV as well as possible upgrades and options are discussed. The opportunities on Standard Model physics, Higgs physics, Supersymmetry and alternative theories beyond the Standard Model are described